The Justice Department on Monday brought charges against five members of the Chinese military for cyber spying on American companies.

The charges were the first ever criminal hacking indictments brought by the United States against a foreign country.

According to the Obama administration, the five People’s Liberation Army hackers aimed their work at six targets in the nuclear, solar and metals industries from 2006 to 2014. The stolen information was shuttled to Chinese competitors of the U.S. firms, including those owned by the Chinese government.